Re: Was Chopper circuit - Now ver 3.2, G298

Hi Alan -

At present, I am planning to build it as a finished unit.

You're right - Marris's G298 is very interesting as the basis for a
higher powered version. However, first things first - I will have to
see how this one goes & then think about what V2 looks like.

Regards,
Tony

--- In CAD_CAM_EDM_DRO@y..., Alan Marconett KM6VV <KM6VV@a...> wrote:
> Hi Tony,
>
> I KNEW I'd heard of a project! Sound like you're way ahead of my
PIC
> project.
>
> How do you intend to release it? As a kit, or do you intend to
make the
> source code, schematics and board layout available to to the list?
>
> Mariss' new G298 board will probably fit in well with your efforts!
>
> Alan KM6VV
>
>
> Tony Jeffree wrote:
> >
> > At 23:14 09/04/2002 +0000, you wrote:
> > >Just thinking; I recall someone on the list that has already
replaced
> > >the 'L297 with a PIC. And the PIC could be the heart of a
single axis
> > >"jogger", for a 4th axis rotary table, for example. Kinda like
> > >Sherline's controller? (Bill's ears perk up). I don't know if
it's any
> > >cheaper, but some things like limit and E-stop switches could be
built
> > >in. Same for PAL (or eqv).
> >
> > Done that...I have an initial production run of single-axis
> > PIC/L297/L298-based rotary table controllers in progress right
now...am
> > working on the documentation as we speak. Headline specs:
> >
> > -Will handle any drive ratio between 1:1 and 99:1 - software
settable
> > -Software settable motor current up to 2A/phase
> > -Idle current can be set as up to 50% of the motor current
> > -Supply voltage up to 40V
> > -Jogs in increments of +- 1/100th, 1/10th, 1 or 10 degrees
> > -Division mode handles all divisions from 1 to 999
> > -Degrees mode handles any angular move in range 0.001 to 360.000
degrees
> > -All moves calculated to the nearest 1/2 step - errors are evenly
> > distributed to avoid cumulative errors creating the "thick or
thin tooth"
> > problem. Display shows desired position and actual angular
position
> > -Can be driven via external step-and-direction signals to use as
a "true"
> > 4th axis
> > -Can be used to drive an external power stage via step-and-
direction
> > signals to allow higher power motors to be used
> > -Controlled/configured via a 16-key keyboard & a 2-line by 16-
char LCD display.
> >
> > Pics & fuller specs to follow...
> >
> > Regards,
> > Tony